Compositional and Equilibrium-Free Conditions for Power System Stability -- Part II: Method and Application

TL;DR

This paper introduces a novel compositional and equilibrium-free framework for power system stability analysis, providing practical methods for verifying stability conditions in complex, heterogeneous power grids.

Contribution

It develops methods to verify delta dissipativity and coupling conditions, enabling stability assessment without relying on equilibrium points, and demonstrates applications through case studies.

Findings

Verified stability conditions on IEEE benchmark systems

Demonstrated stability assessment under varying conditions

Proposed distributed computing framework for stability analysis

Abstract

This two-part paper proposes a compositional and equilibrium-free approach to analyzing power system stability. In Part I, we have established the stability theory and proposed stability conditions based on the delta dissipativity. In Part II, we focus on methods for applying our theory to complex power grids. We first propose a method to verify the local condition, i.e., delta dissipativity, for heterogeneous devices in power systems. Then, we propose a method to verify the coupling condition based on Alternating Direction Method of Multipliers (ADMM). Finally, we investigate three applications of our theory including stability assessment toward multiple equilibria, stability assessment under varying operating conditions, and a distributed computing framework. Case studies on modified IEEE 9-bus, 39-bus, and 118-bus benchmarks well verified our theory and methods.